Keyword difficulty scores and what they miss

I have killed more content briefs because of a keyword difficulty score than I care to admit, and I have also written pages for “hard” keywords that ranked faster than easy ones on the same site. The score was not lying either time. It just wasn’t measuring what I needed it to measure.

Keyword difficulty (KD) is one input, not a verdict. Treated as a verdict, it will talk you out of good opportunities and into bad ones. Here’s what the number actually captures, what it leaves out, and how I use it now that I run a handful of sites and have to make the call myself.

What the score is actually built from

Every major tool with a KD metric builds it the same general way: it looks at the pages currently ranking in the top ten for a keyword and scores how hard their backlink profiles would be to match. More referring domains on the ranking pages, higher score. Fewer, lower score.

That’s it. It’s a backlink proxy dressed up as a difficulty prediction. It doesn’t know what the page says, how long it’s been live, whether it answers the query well, or whether the person searching wants a product, a definition, or a forum thread full of arguing strangers.

Different tools weight things slightly differently, some fold in referring domain diversity, some use their own authority metric on top of raw link counts, but the core input is the same across all of them: what does it take, in links, to look like the pages already there. That’s a real signal. It’s just a narrow one.

The backlink count problem

Two pages can have identical link counts and completely different odds of ranking. One might have twenty links from sites in the same niche, built over three years, pointing at a page that still gets updated. The other might have twenty links bought in a single month from sites that have nothing to do with the topic. A KD score can’t tell them apart. It counts the links, not where they came from or why they’re there.

This cuts both ways. I’ve seen “low difficulty” keywords where every top ten result was a .gov page or a major publisher with almost no backlinks pointed specifically at that URL, because the domain itself is carrying the page. The KD tool reads a thin backlink profile and calls it easy. It’s not easy. You’re not competing with that page’s links, you’re competing with the entire domain’s trust, and no amount of link building on a new page matches that quickly.

I don’t build links through private networks or paid link schemes to try to shortcut this, and I’d steer anyone away from treating those as a safe way to close the gap. They carry real risk to the site, and they don’t fix the underlying mismatch between what the score measures and what’s actually required to compete on a given SERP.

What KD scores don’t see in the SERP

Open the actual results page for a keyword before you trust the score. You’ll often find things the number has no way to account for:

Search intent mismatch. A keyword can show a low KD score while every result is a different content type than what you planned to build. If the top ten is all comparison tables and you were going to write a single-product review, the score is irrelevant. You’re not competing on links, you’re competing on format, and no difficulty tool checks format.

Content freshness requirements. Some queries have SERPs that turn over constantly, news, pricing, product availability, “best of” lists tied to a given year. A low KD score on a fast-moving topic can be misleading because the difficulty isn’t in the links, it’s in the maintenance. You rank, then you fall out three months later when you stop updating and a competitor doesn’t.

Branded and navigational bleed. Some keywords that look generic are secretly branded in searcher behavior. People type the category name but mean one specific product or company. The tool scores the keyword on link difficulty and has no way to flag that most of the demand is loyal to a name, not a topic.

Your own site’s topical fit. KD is calculated from the SERP, never from your domain. A score of “medium” means something different for a site with five years of relevant content and internal links pointing at the new page than it does for a brand new domain with three posts total. The tool has no idea which one you are.

SERP features eat clicks before KD ever shows up

A keyword can have a modest difficulty score and still be a poor use of time because of what sits above and beside the organic results. Featured snippets, “people also ask” blocks, shopping carousels, and ad slots all take up space and clicks regardless of how easy the organic backlink competition looks. I’ve watched a page climb to position three on a “low difficulty” term and barely move traffic because a featured snippet and three ads sat above it. The difficulty score never accounted for any of that, because it only looks at the ten blue links, not the layout around them.

Before I commit real effort to a keyword now, I look at the live SERP, not just the score attached to it. What’s actually taking up the screen matters as much as who’s ranking.

The tactic that’s dead: chasing the “easy list”

For a while, a reasonable-sounding strategy was to pull a huge keyword list, sort by KD ascending, and work down it. Every tool makes this trivial to do, which is exactly the problem. Everyone running the same tools on the same niche ends up sorting the same list the same way and chasing the same “easy” terms at the same time. The keywords that look cheap on paper get contested in practice, because the score is public and the sorting is one click.

I don’t build content calendars off a difficulty-sorted export anymore. It’s not that the metric got worse, it’s that treating a public, easily-sorted number as a strategy stopped working once everyone had access to the same sort button. If a keyword looks easy to you, it looks easy to every other site using the same tool.

What I actually check before writing

Before a keyword makes it onto a brief, I go through the SERP by hand, not just the score:

• What content format dominates the top ten, and can I match or beat it with what I have.
• How many of the ranking pages look like they’re carried by domain authority versus page-specific links.
• What SERP features sit above the organic results and how much room they leave.
• Whether the topic needs ongoing updates or is a write-once page.
• Whether my own site has anything relevant already linking to or near this topic.

None of that produces a number I can sort a spreadsheet by, which is exactly why it doesn’t get skipped in favor of one. The score tells me roughly how many links the current occupants have. It doesn’t tell me anything about whether the keyword is worth the page I’d have to build, and that second question is the one that actually decides whether the work pays off.

If you want more of how we actually pick and prioritize keywords on our own sites, come check out the rest of what we’ve written at The SEO Desk.